All categories

2 years ago

A student can solve 20 problems in 30 minutes. How long would it take him to solve 50 problems? Answer fast please.

Mathematics

2 answers:

Keith_Richards [23]2 years ago

8 0

It will take the student 75 minutes to solve 50 problems.

A student solve 20 problems in 30 minutes
How long it will take him to solve 50 problems is Unknown.

<h2>Further Explanation</h2>

We are going use the cross multiplication method to solve this question

20 problems = 30 minutes

50 problems = X (let x represent the minutes)

Therefore, if you cross multiply, you have:

20 × X = 50 × 30

20X = 1500 (divide both sides by 20)

= 20x / 20 = 1500/20 (20 will cross out 20)

X = 1500 / 20 (how many times can 20 goes in 1500)

X = 75

Therefore, it will take the 75 minutes to solve 50 problems.

Using Cross multiplication method, you multiply the numerator of the left fraction by the denominator of the right fraction and also multiply the numerator of the right fraction by the numerator of the left fraction.

Also, the derived products (two products) must be set equal to each other and then you can solve for the variables.

LEARN MORE:

A student can solve 20 problems in 30 minutes. How long would it take him to solve 50 problems? brainly.com/question/13654479
A student can solve 20 problems in 30 minutes. How long would it take him to solve 50 problems? brainly.com/question/13723806

KEYWORDS:

cross multiplication
50 problems
20 problems
30 minutes
denominator
numerator

Umnica [9.8K]2 years ago

6 0

30*50/20=75 minutes

You might be interested in

Dave has 25 3/4 feet of piping and needs to cut it in 1 1/2 foot measurements for a project. How many pieces of piping will he e

Ostrovityanka [42]

Answer: 17 1/6 or 17-18

(u guess which is right if its an integer ^^)

Step-by-step explanation:

25 3/4 ÷ 1 1/2

First change the mixed fractions to improper fractions.

25 3/4 = 103/4

1 1/2 = 3/2

Now divide: 103/4 ÷ 3/2

103/4 * 2/3 (multiply by flipping the second fraction)

= 206/12

Now divide: 206 ÷ 12

= 17 2/12 (simplified: 17 1/6)

The answer will be 17 1/6 (OR 17-18)

5 0

1 year ago

Barbara drives between Miami, Florida and West Palm Beach, Florida. she drives 45 miles in clear weather and then encounters a t

WINSTONCH [101]

Answer:

Barbara's speed in clear weather is $60mph$ and in the thunderstorm is $38mph$ .

Step-by-step explanation:

Let $v_1$ be the speed and $t_1$ be the time Barbara drives in clear weather, and let $v_2$ be the speed and $t_2$ be the time she drives in the thunderstorm.

Barbara drives 22 mph lower in the thunderstorm than in the clear weather; therefore,

(1). $v_2 = v_1 -22$

Also,

(2). $v_1t_1 = 45miles$

(3). $v_2 t_2 = 57$ ,

and

(4). $t_1+t_2 = 2.25hr$

From equations (2) and (3) we get:

$t_1 = \dfrac{45}{v_1}$

$t_2 =\dfrac{57}{v_2}$

putting these in equation (4) we get:

$\dfrac{45}{v_1}+\dfrac{57}{v_2}=2.25$

and substituting for $v_2$ from equation (1) we get:

$\dfrac{45}{v_1}+\dfrac{57}{v_1-22}=2.25$

This equation can be rewritten as

$2.25v_1^2-151.5v_1+990=0$

which has solutions

$v_1 = 60$

$v_1 = 7.33$

We take the first solution $v_1 =60$ because it gives a positive value for $v_2:$

$v_2 = v_1 -22$

$v_2 = 60 -22\\$

$v_2 = 38$ .

Thus, Barbara's speed in clear weather is $60mph$ and in the thunderstorm is $38mph$ .

4 0

3 years ago

In a race, Andrew ran 4 minutes less than 4 times as many minutes as Chris ran. Write an expression to represent the number of m

Aleksandr [31]

Answer:

4y - 4

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Which statement regarding the function y=cos(x) is true?

MAVERICK [17]

A. cos(x) = cos(-x) [correct, since cos(x) is an even function]
B. Since the cosine function is even, reflection over the x-axis [y-axis] does not change the graph. [false]
C. cos(x) = -cos(x) [ false]
D. The cosine function is odd [even], so it is symmetrical across the origin. [false]

6 0

2 years ago

Read 2 more answers

After an office party, 4 1/3 pizzas are left. A day later, there are 1 5/6 pizzas left. How munch pizza was eaten during the day

IceJOKER [234]

Answer:

15/6 pieces of pizza were eaten. Which is equivalent to 2.5. So 2.5 pizzas were eaten.

Step-by-step explanation:

Just did the math. Convert 4 1/3 to 0/6. So 1 times 2 is 2, and 3 times 2 is 6. Which would give you 4 2/6 which has the same denominator as 1 5/6.

8 0

3 years ago